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При попытке экспортировать исторические данные в .csv файл HistData выдает следующее: Could not initialize tagname AVL tree. Эта ошибка не описана в хелпе (кстати, вся процедура экспорта взята из него).

*.avl – These files will only be created for InTouch version up to InTouch 10.0. However, if you have migrated an application prior to InTouch 10.0 Patch01 this file type will still exist in the application folder. These files represent the compiled version of the Tagname dictionary.

Like the *.wvw files, the *.avl files are needed to run WindowViewer and they are automatically built from the Tagname dictionary file, Tagname.x, at runtime if they do not already exist (This is valid for application versions prior to InTouch 10.0 Patch01).

The tagname.avl will only be created for application versions up to InTouch 10.0.
If you have created an application with InTouch version 10.0 Patch01, you will not see the tagname.avl file in the application folder. However, if you have migrated an older application which had tagname.avl to the latest InTouch version,you will still see the tagname.avl in the application folder.
If you delete the tagname.avl after InTouch version 10.0 Patch01 then this file will not be re-created.